Process for manufacturing cast articles



of sulphur having Patented Aug. 26, 1924.

PATENT OFFICE.

WILLY HENKER, OF NEUKOLLN, NEAR BERLIN, GERMANY.

PROCESS FOR MANUFACTURING CAST ARTICLES.

No Drawing.

To all whom it may concern:

Be it known that I, WILLY HENKER, a citizen of the German Republic, residing at Neukolln, near Berlin, Germany, have invented certain new and useful Improvements in Processes for Manufacturing Cast Articles, of which the following is a specification.

It is known that cast articles having a somewhat metallic appearance can be obtained by mixing sand which contains finely divided metal, preferably iron with divided sulphur, heating the mass to about the melting temperature of the sulphur and allowing the molten mass to solidify in suitable moulds by cooling. This invention relates to this kind of manufacture and has for its main purpose to increase the durability of the articles produced thereby and to allow articles of marmoraceous appearance to be manufactured in a very simple and efiicient manner.

For securing the above effects there are prepared a molten mass consisting of sulphur having evenly distributed therein sand and fine particles of metal, and said mass is maintained at a temperature of about the melting point of sulphur. This first mass is brought together with a second, consisting distributed therein finely divided magnesite (carbonate of magnesia) and kept at a temperature considerably above the molten mass temperature of sulphur. The higher temperature of this melting allows an even distribution ofthe magnesite throughout the sulphur and more over it makes the melting thicker than that containing the sand and metal. This'is an important point in the manufacture of articles having a marmoraceous appearance as will become clear lateron.

In carrying the invention into practice one can proceed as follows:

47 parts in weight of metalliferous sand obtained by removing the surface layer of cast metal objects, preferably iron castings, by a sand blast, are mixed with 53 parts of sulphur in fine division and the mixture heated to a temperature of about 122 C. so as to melt the sulphur. Furthermore parts in weight of pulverized magnesite are mixed with 55 parts of pulverized sulphur and the mixture heated to a temperature of about 200, bringing it into the condition of a substantially homogeneous liquid fit for Application filed December 6, 1921.

Serial No. 520,460.

casting. One part of this last named molten mass is introduced into two parts of the first named molten mass, mixed therewith, and poured into suitable moulds and left to solidify by cooling. If it is desired to secure special color effects suitable dye-stuffs may be added.

Owing to its higher temperature the mass containing the pulverized magnesite .is thicker than the mass containing the metalliferous sand. This allows a convenient manner of producing marmoraceous efiects by pouring the thicker liquid into the thinner one contained in amould while the crucible is moved with relation to the mould. Thus any desiredconfiguration of a band of the thicker liquid within the thinner liquid can be produced which by shaking can be brought to gradual transition ,to the thinner liquid, thereby producing attractive color eifects at the boundaries.

What I claim is:

1. Process of manufacturing cast articles consisting in mixing on the one hand.

sand which contains finely dividedmetal and on the other hand magnesite (carbonate of magnesia) with divided sulphur, heating the first mixture up to the melting point of the. sulphur and the second to a temperature considerably above said point, bringing the two meltings together and allowing the molten mass to solidify by cooling.

2. Process of manufacturing cast articles consisting in mixing on the one hand sand which contains finely divided metal and on the other hand magnesite (carbonate of magnesia) with divided sulphur, taking in the first case about 53 parts of sulphur on about 47 parts of sand and in the second case about 55 parts of sulphur on about 4.5 parts of magnesite heating the first mix ture up to the melting point of the sulphur and the second to a temperature considerably above said point, incorporating about 1 part of the last mentioned melting into about 2 parts of the first mentioned melting and allowing the molten mass to solidify by cooling.

3. Process of manufacturing cast articles consisting in mixing on the one hand sand which had been obtained by cleaning the surface of cast metallic articles by a sand blast and on the other hand magnesite (can bonate of magnesia) with divided sulphur, heating the first mixture up to the melting? point of the sulphur and the second to a temperature considerably above said point, bringing the two nieltings together and allowing the molten mass to solidify by cool- Process of manufacturing cast articles consisting in mixing on the one hand sand which contains finely divided metal and on the other hand magnesite (carbonate of 10 magnesia) with divided sulphur, heating-the first mixture up to the melting point of the sulphur and the second to a temperature considerabl above said point, pouring a stream of the last mentioned melting into the first melting while moving the crucible with relation to the mould during pouring.

In testimony whereof, I aflix my signature.

WILLY HENKER. 

